Something men should do when talking with a woman in a bar. You need to check the throat to make sure they are a woman and not a man. If you feel an Adam's apple, it's a man, not a woman. Must be subtle when doing it, as not to offend the lady. It could save you pain and embarrassment later.

Dude 1: That girl is smokin' hot!
Dude 2: Naw man, check the throat. I did and that's a dude. Dude looks like a lady.